Is it valid to shorten some of the hair on the head without covering the entire head in the rites of pilgrimage?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: We see some people in 'Umrah or Hajj who do not shave or shorten the hair of the entire head, but rather take a little from one side and a little from the other side. What is the ruling on their action?

Answer:
This is a deficiency in the shortening. It is obligatory to cover the entire head. They say he takes from its aggregate, not from all of it. It is not from every single hair, no, but from the aggregate, from the aggregate of the head, from here and here, and the middle, and the sides. He does not leave a side from which he does not take.